12818961 has 12 divisors (see below), whose sum is σ = 18598788. Its totient is φ = 8507904.

The previous prime is 12818959. The next prime is 12819007. The reversal of 12818961 is 16981821.

It can be written as a sum of positive squares in 2 ways, for example, as 4730625 + 8088336 = 2175^2 + 2844^2 .

It is not a de Polignac number, because 12818961 - 2¹ = 12818959 is a prime.

It is a super-2 number, since 2×12818961² = 328651522239042, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12818941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 960 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (1549899).

Almost surely, 2^12818961 is an apocalyptic number.

It is an amenable number.

12818961 is a deficient number, since it is larger than the sum of its proper divisors (5779827).

12818961 is a wasteful number, since it uses less digits than its factorization.

12818961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6352 (or 6349 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 12818961 is about 3580.3576636979. The cubic root of 12818961 is about 234.0368668628.

The spelling of 12818961 in words is "twelve million, eight hundred eighteen thousand, nine hundred sixty-one".